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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff49ec3765667b7803afc3b5d5cca83cb66a4504909de24f33effc00b39cdb88' 
  AND token = '8E6A2jF/0nS8c6AkR18ilhqaaQkaxvwEMnZU+hVEET8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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