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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd79c6d09fcf20b1a0ae1b826750295de557bd4bede69a581b9f2a9da72a738a6' 
  AND token = 'MnFDeH1j9v8Gv98XOOBtqQX3xMR1u+kDTaIv4yHNyvg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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