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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4763ad32a9a7425a8f8dd95aa2363d9b336c13617904436752ba594fe6fe20e4' 
  AND token = '8RXQMk/Q9hd3gWPmAcABAapUmn0JatmRn5Vlen1cOoM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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