SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2da57a3a48ad9e35067be1ba9918f88d3832c7e112345b0d841ee2003fe6d914' 
  AND token = 'tEzYHfT1Js/Yunmj5PIigg/zqZB/eU4czQPj2y6Ox7c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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