diff --git a/ariadne/db/database.py b/ariadne/db/database.py
index 961910d..ba1b2b5 100644
--- a/ariadne/db/database.py
+++ b/ariadne/db/database.py
@@ -67,7 +67,10 @@ class Database:
             except Exception:
                 pass
             row = conn.execute("SELECT pg_try_advisory_lock(%s)", (lock_id,)).fetchone()
-            locked = bool(row and row[0])
+            if isinstance(row, dict):
+                locked = bool(row.get("pg_try_advisory_lock"))
+            else:
+                locked = bool(row and row[0])
             if not locked:
                 return
             try: