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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c76a94088d34a129b3c29646860054a41e597cb84ad2473a1467ae8f87f139e0' 
  AND token = 'TxvBxd95HXWtuFQ2Y4/XBmM6PoloRU7KUxMgnLt6B8Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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