SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '280ce6e3989f88395d370da082b9d99989424be3700e5271003d0131b4f3d77b' 
  AND token = 'TSM/yh7y6U3iQrD3wDCEaTpfg68LAWzAUAPWa2tEbu0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

Explain
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE Impossible WHERE noticed after reading const tables