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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '101df3dce8f206b30ed01d90cad65b7156b804627615134e73df78396d36b3b8' 
  AND token = 'esynB/FYi47Ysa9jBPG5GnddVF77d7zeq2+pOck2cFM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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