SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9aa3d37371dd48dc5f76b896060a7130ba94f9de89263c31e9e1df1bc30b5ea' 
  AND token = 'qbBFcg7QZrqCRoL8+oiDVTehvluKWKCzKOUkfJNZOrs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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