SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6008eedc13c9c02c8d4b323cacb457bdf6e7d9feb164f62a905527248a9b455d' 
  AND token = 'vE87JRYiqJNFl0MJghgv4nGAX0GSNxsEzNswoJazm+o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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