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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d6be1bb848bac4b18d12c1347fd6338fc45d2cc1e8aa03a6f53d930bc1d41f4' 
  AND token = 'sa+Xwd9hMmmo0KE6PLHf6ZZGH4miVqEuknNdgr3WFc8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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