diff --git a/notebooker/serialization/mongo.py b/notebooker/serialization/mongo.py
index 0a181f93..17a1e2a4 100644
--- a/notebooker/serialization/mongo.py
+++ b/notebooker/serialization/mongo.py
@@ -10,6 +10,9 @@
 from notebooker.constants import JobStatus, NotebookResultComplete, NotebookResultError, NotebookResultPending
 
 logger = getLogger(__name__)
+REMOVE_ID_PROJECTION = {"_id": 0}
+REMOVE_PAYLOAD_FIELDS_PROJECTION = {"raw_html_resources": 0, "raw_html": 0, "raw_ipynb_json": 0}
+REMOVE_PAYLOAD_FIELDS_AND_ID_PROJECTION = dict(REMOVE_PAYLOAD_FIELDS_PROJECTION, **REMOVE_ID_PROJECTION)
 
 
 class MongoResultSerializer:
@@ -232,9 +235,7 @@ def get_all_results(
             base_filter.update(mongo_filter)
         if since:
             base_filter.update({"update_time": {"$gt": since}})
-        projection = (
-            {"_id": 0} if load_payload else {"raw_html_resources": 0, "raw_html": 0, "raw_ipynb_json": 0, "_id": 0}
-        )
+        projection = REMOVE_ID_PROJECTION if load_payload else REMOVE_PAYLOAD_FIELDS_AND_ID_PROJECTION
         results = self.library.find(base_filter, projection).sort("update_time", -1).limit(limit)
         for res in results:
             if res:
@@ -247,8 +248,19 @@ def get_all_result_keys(self, limit: int = 0, mongo_filter: Optional[Dict] = Non
         base_filter = {"status": {"$ne": JobStatus.DELETED.value}}
         if mongo_filter:
             base_filter.update(mongo_filter)
-        projection = {"report_name": 1, "job_id": 1, "_id": 0}
-        for result in self.library.find(base_filter, projection).sort("update_time", -1).limit(limit):
+        results = self.library.aggregate(
+            [
+                stage
+                for stage in (
+                    {"$match": base_filter},
+                    {"$sort": {"update_time": -1}},
+                    {"$limit": limit} if limit else {},
+                    {"$project": {"report_name": 1, "job_id": 1}},
+                )
+                if stage
+            ]
+        )
+        for result in results:
             keys.append((result["report_name"], result["job_id"]))
         return keys
 
@@ -307,6 +319,7 @@ def get_latest_successful_job_ids_for_name_all_params(self, report_name: str) ->
         results = self.library.aggregate(
             [
                 {"$match": mongo_filter},
+                {"$project": REMOVE_PAYLOAD_FIELDS_PROJECTION},
                 {"$sort": {"update_time": -1}},
                 {"$group": {"_id": "$overrides", "job_id": {"$first": "$job_id"}}},
             ]
diff --git a/tests/unit/serialization/test_mongoose.py b/tests/unit/serialization/test_mongoose.py
index 74bb414b..7617ba39 100644
--- a/tests/unit/serialization/test_mongoose.py
+++ b/tests/unit/serialization/test_mongoose.py
@@ -32,7 +32,11 @@ def test_get_latest_job_id_for_name_and_params(_get_all_job_ids, conn, gridfs):
 def test__get_all_job_ids(conn, gridfs):
     serializer = MongoResultSerializer()
     serializer._get_all_job_ids("report_name", None, limit=1)
-    serializer.library.find.assert_called_once_with(
-        {"status": {"$ne": JobStatus.DELETED.value}, "report_name": "report_name"},
-        {"_id": 0, "job_id": 1, "report_name": 1},
+    serializer.library.aggregate.assert_called_once_with(
+        [
+            {"$match": {"status": {"$ne": JobStatus.DELETED.value}, "report_name": "report_name"}},
+            {"$sort": {"update_time": -1}},
+            {"$limit": 1},
+            {"$project": {"report_name": 1, "job_id": 1}},
+        ]
     )