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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67e92b14386b19c9c314a866b8de08c9f9d817dd3abfba4d47a09d77782aa840' 
  AND token = 'lM9qVKDd1MpFo7lAkJY8jIioqErd3DhjzunEYjbbRcQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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