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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94317b64672eef9e889a6ded2cd73ad089e070e3f814e7c83860986778d76ef0' 
  AND token = 'yHxyrFqK6smwpgUFnZDsSpVsftUj3Cu/gE1vLbeNPYk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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