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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a6aa8477afd45b239c21962eb13d8b6e234f01cabfff744b0e0a401f658b93f' 
  AND token = 'LTgdu0poMxJdeQntmNHBAY2cOSGa2CI17WtCgNSExJU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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