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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cbaa54d4dadad6c6604cb8b7b5fa40e579ca8ae991d9933b55c29dc81055dd1b' 
  AND token = '2V0gBkSeFQOLzZrSWO9tREfW78/wlHQ4JD3EuBIYB7U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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