SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'daad2dfeb37f996f1aa03152eeaeb7310e8e480da73e803933737bda924d6089' 
  AND token = 'G1GP8jFJoAbuQCpYcvWErh4VCd2L5SA/iKZDS4+/wV8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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