SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2aa4d05c493cd64d570673a565e6bfbf0b7e162954449d6cc6ef35e2853cc3d8' 
  AND token = 'eKlFQaCBsixjwNLGwbzncGb/9Q75DgYOCjNJLN9Zxwc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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