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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24526c7b56ee52126b4df656a8d512c2557ffeca80f24432b64c6e6300b77c52' 
  AND token = 'oX+vvl266InLeo+PBajXVhGRxUxYfqxARL0Wqo6Co8U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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