SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd634effc47ad6ea136cc7b16136f97f43654ceb95cb9d916000074c3038a32b5' 
  AND token = 'kKQCDjvQDJrYUiIL8+xWRfNrvb1yeWzqzVV3qBCq6og=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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