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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71ed033b648ed14f8b23a3c836830bf88060b8583d614d18541fcbfaffa7334a' 
  AND token = 'RCElJLCms285V4bd2ZGa5n14ASb2/d3x6UTVtd+IH8I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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