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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a326193ffd875da864f156171f76b961f0bc519a8fce52c56958f12320e7656d' 
  AND token = 'AEiEY5cBq2J4pFXdxVqJAwRytZdi+PSH9odx3zrOHas=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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