SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4832bfe814556a79d7bb0919bb49aa6e7494602d1dd12ef35c4192c7fa1a0809' 
  AND token = 'jLXxPjSYhcAjAaoLI6vFKrP0eK+G5V12bBzl+fSznsc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}