SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c587ef70ae3a288c70845b56a43675199649ef062c4c12e4e981ad2bebbfe79c' 
  AND token = 'GJvpDqNu+4zYIH1B4vkcdQZxGghYByDWTarmNlslC8U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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