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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff5a6653da4aec02d4d6ff790365885bc04d9fccb93acf8feed8a52ed12d1d7e' 
  AND token = 'cWluuDhckFAYOpCgQnrScKi8R5CGHXtKGXWd6zk5EFo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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