SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4331f052ea196c837d27111d46ef1b3f8a5b0226b75baca5860c4c8b40f65a83' 
  AND token = 'kz+hI250GGPzHFbzjLByfFI+R/+qPMnaJZkcC49hV34=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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