SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30ce3ccdf17ce056917111d05960028b7e369b0f6e5ba6b65b5bd2afbfe704a1' 
  AND token = 'DBCRY/e++QmK3LUYHpaVVUVvXk/Ng9IFmzF3IHw/Cro=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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