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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9aab1971608a58b4c089ecd119d8cd1a33a82e28a763fe7c90b5593c13245e8c' 
  AND token = 'IeY0yBExUDFHCpsEBNqr/NS/0Nn8SoW7ycSoklPNhfo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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