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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93fe456802f87ccb6b39debaba52fa44154dbc665e1045c78bfc395676327d7b' 
  AND token = '0t1J4NWchhD6yIobO7ZHkt+DoNKmAHVMoN6U8sUd3vk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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