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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47a8c692d95d8e948aa58c0d91f10b904d9fbe2d49c6a0967abc7db307460317' 
  AND token = 'XxN8AhqeWT5UV+T1d8gkmJDKSZdukd5436O6H+3EdVs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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