SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9af72531b16a46fd1a09435fd27b15cc4b445956394f281226af8ab78ca09560' 
  AND token = 'mD4+h5DKsQGV2JomoqrzF2IgwfcogM8w2C7St/BJVvw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}