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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '854fb5fd6783862ebd8ebc96aed9550bf44e6ae80c642750461b62d0d071d933' 
  AND token = 'b/FVg/83S6kA9/9gM3vG7xw7/m/5ubzaE7PvhQjNt5M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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