diff --git a/lms/djangoapps/courseware/migrations/0015_add_courseware_stats_index.py b/lms/djangoapps/courseware/migrations/0015_add_courseware_stats_index.py
new file mode 100644
index 0000000000..f92418c9a9
--- /dev/null
+++ b/lms/djangoapps/courseware/migrations/0015_add_courseware_stats_index.py
@@ -0,0 +1,17 @@
+# Generated by Django 2.2.18 on 2021-02-18 17:35
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('courseware', '0014_fix_nan_value_for_global_speed'),
+    ]
+
+    operations = [
+        migrations.AddIndex(
+            model_name='studentmodule',
+            index=models.Index(fields=['module_state_key', 'grade', 'student'], name='courseware_stats'),
+        ),
+    ]
diff --git a/lms/djangoapps/courseware/models.py b/lms/djangoapps/courseware/models.py
index 714d2f2afc..8d2087b137 100644
--- a/lms/djangoapps/courseware/models.py
+++ b/lms/djangoapps/courseware/models.py
@@ -103,6 +103,9 @@ class StudentModule(models.Model):
     class Meta(object):
         app_label = "courseware"
         unique_together = (('student', 'module_state_key', 'course_id'),)
+        indexes = [
+            models.Index(fields=['module_state_key', 'grade', 'student'], name="courseware_stats")
+        ]
 
     # Internal state of the object
     state = models.TextField(null=True, blank=True)