diff --git a/pywb/warcserver/index/indexsource.py b/pywb/warcserver/index/indexsource.py
index 9ef408f2..66ca7216 100644
--- a/pywb/warcserver/index/indexsource.py
+++ b/pywb/warcserver/index/indexsource.py
@@ -292,8 +292,12 @@ class RedisIndexSource(BaseIndexSource):
 
         key = res_template(member_key, params)
 
-        keys = self.redis.smembers(key)
-        params['scan:' + key] = keys
+        scan_key = 'scan:' + key
+        # check if already have keys to avoid extra smembers call
+        keys = params.get(scan_key)
+        if not keys:
+            keys = self.redis.smembers(key)
+            params[scan_key] = keys
 
         match_templ = match_templ.encode('utf-8')
 
diff --git a/requirements.txt b/requirements.txt
index c32c542d..175a4fc6 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -9,6 +9,6 @@ brotlipy
 pyyaml
 werkzeug
 webencodings
-gevent==1.2.1
+gevent==1.2.2
 webassets==0.12.1
 portalocker