SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '202875817f49683f6bbb111d1ce0c14860dc28d4209806ef715a8217e43865c5' 
  AND token = '4t0w+ZCXhh3VnjCmuOHVON5ecl7SaZAT/TB0vz2ReSU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

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