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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d9a9da2b93f5448937fd815eee603ec095ff385675f7825d7285e028cd83772' 
  AND token = 'PWR9/kIEj4u7jhnN9ScPwd7Pi87BeWtWqA4jhb/SJds=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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