SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '011023834cdfc17d77d56144835d91489f421225be1a4a830fc5dacad74efcd6' 
  AND token = 'xUzhLD/h7qFuS9AeR5Zs9OFz8oxJ5j2KWalxf1CGmCI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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