Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0c50df320a8cc44e3572185ecf2d9303a242034eecd95a3a0fa64b613cafa5f' 
  AND token = 'cRM+go/x8PPLowxOIx9+YZu+NwaIKLjpIgGbiLGhjJc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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