redis add

@@ -121,7 +121,7 @@ trait RedisQuery {
      */
     public function add($key,$val,$ttl=null):mixed {
         return $this->getClient()->eval(
-            "return redis.call('exists',KEYS[1])<1 and redis.call('setex',KEYS[1],ARGV[2],ARGV[1])",
+            "return redis.call('set', KEYS[1], ARGV[1], 'EX', ARGV[2], 'NX')",
             [$key, $this->serialize($val), $ttl],
             1
         );