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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c8dccceb56b51a282b9b10f78ad95d0d675e6cc7e934bd898032b1df69c7ea8' 
  AND token = 'sPhdrseL/zmOt0wkBCJiYC+RfsJQOejW0Kqo5iWOpFU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00226

JSON explain

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