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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7595e983513875dd7bc6b7d6f97e2e8f413e770c26d4c687f216213f1169582' 
  AND token = 'X3xPLftSqTMWJmCKd7MI1lGmPLg2xd2rIHKVBizzORU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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