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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82b99f35b7fddf3935ce145e2ce377822e556fbc9bf37bd68b248b0731ac9d20' 
  AND token = '8S2WbOcr8kYR12KoB1sbVDi+ZCSLD6maJyCDVIQk920=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}