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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e04da598f2128fe3f7cc4d0eb0406e236a6d335d831cf7adf1ad1940ff4286a1' 
  AND token = 'ujWOzDxr04WEFoaHUF1k2MJfk5eukpqet7R56iY41os=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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