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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa0fb8dedb514810f61ce7be046d9ec302919672445232b5473d9e6f30ae2708' 
  AND token = 'CH74au34XxUZqbJMxMeHZgELO9Q35f3DWfJ08CMl5Bg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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