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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6114807d7de5df9163894f7a7c71c9d76e5151e972403338416537e157deeeac' 
  AND token = 'ahgJ7H2WEsu01WsYFjKtD5KG2Q2NDSgBI13Ya8/BvSU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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