SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c959db1094e4cc8bf622b8e69567ba078e16d1fcad38a4e7473c37bc9439bb28' 
  AND token = '7vvIdQp6CfUNR3jIHPXnT3tdW/aRppKBv35wemX+vjY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

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