SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4b90048924d42079ac5d2d5f6e6b0528e7d48780b22a8fedc44b473ad3b0621' 
  AND token = 'v0Asqlwbc5m371uSeo2VGmsl/IxyQhYeN5ho1QKlP0c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

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