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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d1bc29ad438478ea3440a7df15136bd02dcfc02dc3e92abf83be461d6540084' 
  AND token = 'ZqNN+7svodB+xSYrkJhGT9MraYh8jNnkd+yO18I1YQc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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