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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e24895d9a3dab07586c8663ccb064a49df68effcf09c7ad9d7ad01f2d2271aae' 
  AND token = '5JstQ9dfdjj+C+8F4BqLN9wjcKorLtP/pxoP8MTIr/8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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