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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '367aa99587d69d3dc164cd5e0ea2513c366898c3dbc96d06dd27e48fea873f96' 
  AND token = 'cJi7q66LfvDeGfC9kxfK9Cbo6IkMRBtTwkmcJ04LHTI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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