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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '859b889982991b7d2dda66c0c2065d35805c93d356a35644707912305d0f76f4' 
  AND token = 'WGAn8axpB63joMwDGGh9EIQInUGfquw3dCE3tyDI+rM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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