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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfe7337c83d85d47dc5630a24f9e9fc346392c0ea5b9864852b2d347bd11dedc' 
  AND token = 'mo/U2dMRksT9G0Xb7jO2HtWlx3LMilDXnWyf13zEazI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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