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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd12827d22a10944c1b24ccbce0d42877af043aa34a904fe8decc6f5f806a4cc0' 
  AND token = '9xfOYMnf3OYkV6mTYdUPV+qCat3obr0l/1KULVFWOeY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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