SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce8daf874905f54157b83c5ac09da13418fa9ac55ef7972f243eb64ad9d70e28' 
  AND token = 'tldKAoRuxrgp3uuBJbsRpn+x+WOhGAFRdzqqZdTUEew=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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