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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '42aa613bf29f7b5747e4d6a808a911980f647ba1caa7c3c7329e4bc07d92024b' 
  AND token = 'W5OwYkOHQ+4CwUhCfQ/kQ0CQhx4dUn0QsTgGjgxjD+E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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