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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7cd2ec7dbc12c818b4e3fcc369addda1528d2cee77f7fb8a81eba1e632062dd9' 
  AND token = 'ZjBsq9xmcA7NgIwPwkTwojtwgqYWp1guw1Ee3sSI8bU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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