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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '495d06837b5a77311bdc03668815dada5b9df3cee2838c228612f8b5e31cd5e2' 
  AND token = '7KnjFMvk0s3UZExkSdKzzhwCYn4awEGBkz0aLyF0Z0U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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