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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a729cedef9dea29d50f0716274fcfb08515d045561f779160b9a8ee6882fb966' 
  AND token = 'cTKSE0gUi0MQ21VHbOCCa5NGqht0cs6m+hausSUafQ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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