SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '142539ec674c9b3e1322df25954653af8401c67ef6994857afb7140598ecfc4f' 
  AND token = 'uBjw2cGM9ExnkQj3FDM55cfKx25evRvoNWPq5/y8LJQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

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