Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d3875a2f9e344285188888f9aaa27096ee56817f3456865b802d5e3e453a972' 
  AND token = 'jnbTO+DSaQiKk744ZdVzcWB5fPse4OSAKlPeuRtTwSo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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