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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da0f60554aa999cb3a28fd9bf7ed668d2f9ad0b57f8f1a92f86539c327119684' 
  AND token = '1KVgSnb/CMd8gA80OH54WUooiOJfGIrW0qJHH2NnnzI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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